One of the lakes I fish you aren't supposed to drop any cover in them. I seen a boat loaded down with Christmas trees one day and stopped to talk with them. They were doing some conservation thing or something. They placed new duck boxes and were dropping 50 trees. Supposed to turn gps locations over to the city so they could map them. I know if I hadn't talked with them or seen them those trees would be gone before the city ever updates the map showing locations....lol.